

let a = { url: "houdunren" };
let b = { name: "后盾人" };
Object.prototype.web = "hdcms.com";
console.log("web" in a);
Object.setPrototypeOf(a, b);
console.log("name" in a);
console.log(a.hasOwnProperty("name"));
for (const key in a) {
  if (a.hasOwnProperty(key)) {
    console.log(a[key]);
  }
}